Buggy code:
public class DefaultSynchronizeService extends DefaultService implements SynchronizeService { public DefaultSynchronizeService ( Drive d , Services stub ) { } @ Override public void init ( ) throws IOException { } @ Override public void synchronize ( ) throws IOException { } private void addToSnapshot ( Snapshot root , ChangeRecord remoteChange ) { switch ( remoteChange . getOperation ( ) ) { case REMOTE_INSERT : String localName = stub . storage ( ) . remoteToLocal ( ) . get ( remoteChange . getRemoteFileId ( ) ) ; if ( StringUtils . isEmpty ( localName ) ) { return ; } File localFile = DriveUtils . absolutePath ( localName ) ; String parent = DriveUtils . relativePath ( localFile . getParentFile ( ) ) ; if ( root . getName ( ) . equals ( parent ) ) { for ( Snapshot sn : root . getChildren ( ) ) { if ( sn . getName ( ) . equals ( localName ) ) return ; } Snapshot sn = stub . snapshot ( ) . make ( localFile ) ; root . addChild ( sn ) ; } else { for ( Snapshot sn : root . getChildren ( ) ) { if ( parent . startsWith ( sn . getName ( ) ) ) { addToSnapshot ( sn , remoteChange ) ; return ; } } logger . warn ( MessageFormat . format ( "Remote<seq2seq4repair_space>insert<seq2seq4repair_space>cannot<seq2seq4repair_space>find<seq2seq4repair_space>local<seq2seq4repair_space>parent<seq2seq4repair_space>{0}" , remoteChange ) ) ; } break ; case REMOTE_CHANGE : { String fileName = remoteChange . getLocalFile ( ) ; if ( fileName . equals ( root . getName ( ) ) ) { com . google . api . services . drive . model . File remoteFile = remoteChange . getContext ( 0 ) ; root . setMd5Checksum ( remoteFile . getMd5Checksum ( ) ) ; } else { for ( Snapshot sn : root . getChildren ( ) ) { if ( fileName . startsWith ( sn . getName ( ) ) ) { addToSnapshot ( sn , remoteChange ) ; return ; } } <START_BUG> logger . error ( MessageFormat . format ( "Remote<seq2seq4repair_space>change<seq2seq4repair_space>cannot<seq2seq4repair_space>find<seq2seq4repair_space>local<seq2seq4repair_space>parent<seq2seq4repair_space>{0}.<seq2seq4repair_space>Should<seq2seq4repair_space>be<seq2seq4repair_space>an<seq2seq4repair_space>error." , remoteChange ) ) ; <END_BUG> } break ; } case REMOTE_RENAME : { String fileName = remoteChange . getLocalFile ( ) ; if ( fileName . equals ( root . getName ( ) ) ) { com . google . api . services . drive . model . File remote = remoteChange . getContext ( 0 ) ; String newName = remote . getTitle ( ) ; root . setName ( newName ) ; } else { for ( Snapshot sn : root . getChildren ( ) ) { if ( fileName . startsWith ( sn . getName ( ) ) ) { addToSnapshot ( sn , remoteChange ) ; return ; } } logger . error ( MessageFormat . format ( "Remote<seq2seq4repair_space>rename<seq2seq4repair_space>cannot<seq2seq4repair_space>find<seq2seq4repair_space>local<seq2seq4repair_space>corresponding<seq2seq4repair_space>{0},<seq2seq4repair_space>should<seq2seq4repair_space>be<seq2seq4repair_space>an<seq2seq4repair_space>error" , remoteChange ) ) ; } break ; } case REMOTE_DELETE : String fileName = remoteChange . getLocalFile ( ) ; if ( StringUtils . isEmpty ( fileName ) ) { return ; } for ( int i = 0 ; i < ( root . getChildren ( ) . size ( ) ) ; i ++ ) { Snapshot sn = root . getChildren ( ) . get ( i ) ; if ( fileName . equals ( sn . getName ( ) ) ) { root . getChildren ( ) . remove ( sn ) ; return ; } if ( fileName . startsWith ( sn . getName ( ) ) ) { addToSnapshot ( sn , remoteChange ) ; return ; } } logger . warn ( MessageFormat . format ( "Remote<seq2seq4repair_space>change<seq2seq4repair_space>cannot<seq2seq4repair_space>find<seq2seq4repair_space>local<seq2seq4repair_space>corresponding<seq2seq4repair_space>{0},<seq2seq4repair_space>possibly<seq2seq4repair_space>caused<seq2seq4repair_space>by<seq2seq4repair_space>deleting<seq2seq4repair_space>of<seq2seq4repair_space>parent<seq2seq4repair_space>folder" , remoteChange ) ) ; break ; default : throw new IllegalArgumentException ( ) ; } } private FailedRecord correct ( FailedRecord fr ) { } private void synchronize ( ChangeRecord record ) throws IOException { } private List < ChangeRecord > remoteChange ( ) throws IOException { } protected List < ChangeRecord > compare ( Snapshot standard , Snapshot current ) { } protected long changes ( List < Change > changes ) throws IOException { } private File pathToLocal ( String remoteFileId , List < ParentReference > path ) throws IOException { } private void deleteLocalFile ( File file ) { } }

Fix:
logger . error ( MessageFormat . format ( "Local<seq2seq4repair_space>root<seq2seq4repair_space>doesn't<seq2seq4repair_space>contain<seq2seq4repair_space>this<seq2seq4repair_space>file<seq2seq4repair_space>{0}.<seq2seq4repair_space>Should<seq2seq4repair_space>be<seq2seq4repair_space>an<seq2seq4repair_space>error." , remoteChange ) ) ;